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devip: allow setting the "trans" flag on a logical interface

This makes the interface route have the "t"-flag,
which causes packets routed to the interface to get
source translated.

--- a/sys/src/9/ip/ipifc.c

+++ b/sys/src/9/ip/ipifc.c

@@ -465,8 +465,10 @@

 	memset(rem, 0, IPaddrlen);

 	switch(argc){

 	case 6:

-		if(strcmp(argv[5], "proxy") == 0)

+		if(strstr(argv[5], "proxy") != 0)

 			type |= Rproxy;

+		if(strstr(argv[5], "trans") != 0)

+			type |= Rtrans;

 		/* fall through */

 	case 5:

 		mtu = strtoul(argv[4], 0, 0);

@@ -523,7 +525,7 @@

 			if(!lifc->onlink && lifcp->onlink){

 				lifc->onlink = 1;

 				addroute(f, lifc->remote, lifc->mask, ip, IPallbits,

-					lifc->remote, lifc->type, ifc, tifc);

+					lifc->remote, lifc->type&~Rtrans, ifc, tifc);

 				if(v6addrtype(ip) != linklocalv6)

 					addroute(f, lifc->remote, lifc->mask, ip, IPnoaddr,

 						lifc->remote, lifc->type, ifc, tifc);

@@ -569,7 +571,7 @@

 	/* add route for this logical interface */

 	if(lifc->onlink){

-		addroute(f, rem, mask, ip, IPallbits, rem, type, ifc, tifc);

+		addroute(f, rem, mask, ip, IPallbits, rem, type&~Rtrans, ifc, tifc);

 		if(v6addrtype(ip) != linklocalv6)

 			addroute(f, rem, mask, ip, IPnoaddr, rem, type, ifc, tifc);

 	}

@@ -664,7 +666,7 @@

 	if(lifc->onlink){

 		remroute(f, lifc->remote, lifc->mask,

 			lifc->local, IPallbits,

-			lifc->remote, lifc->type, ifc, tifc);

+			lifc->remote, lifc->type&~Rtrans, ifc, tifc);

 		if(v6addrtype(lifc->local) != linklocalv6)

 			remroute(f, lifc->remote, lifc->mask,

 				lifc->local, IPnoaddr,

@@ -907,6 +909,8 @@

 	int h;

 	type |= (lifc->type & Rv4);

+	type &= ~Rtrans;

+

 	qlock(f->self);

 	if(waserror()){

 		qunlock(f->self);